Gentilly
Becancour, QC·CANDU
Reactor Data
Reactor Units
Every power reactor at this site as listed in the IAEA Power Reactor Information System (PRIS): reactor type and model, net electrical capacity, grid connection and commercial operation dates, and current status.
2 units: 2 permanent shutdown.
| Unit | Type | Model | Net MWe | Construction | Grid | Commercial Op | Shutdown | Status |
|---|---|---|---|---|---|---|---|---|
| Gentilly 1 | HWLWR | HW BLWR 250 | 250 | 1966-09-01 | 1971-04-05 | 1972-05-01 | 1977-06-01 | Permanent Shutdown |
| Gentilly 2 | PHWR | CANDU 6 | 635 | 1974-04-01 | 1982-12-04 | 1983-10-01 | 2012-12-28 | Permanent Shutdown |
Capacity, milestones and suppliers
| Unit | Design MWe | Gross MWe | Thermal MWt | First Criticality | Reactor Supplier | Turbine Supplier | Notes |
|---|---|---|---|---|---|---|---|
| Gentilly 1 | 250 | 266 | 792 | 1970-11-12 | ATOMIC ENERGY OF CANADA, LTD. | ||
| Gentilly 2 | 645 | 675 | 2,156 | 1982-09-11 | ATOMIC ENERGY OF CANADA, LTD. | BROWN BOVERI ET CIE |
Lifetime performance, through 2025
| Unit | Electricity Supplied | Load Factor | Energy Availability | Operating Factor |
|---|---|---|---|---|
| Gentilly 1 | 0.8 TWh | 4.8% | 4.8% | 6.6% |
| Gentilly 2 | 124.2 TWh | 76.3% | 79.3% | 81.2% |
Operator: HYDRO QUEBEC
Owner: Canadian Nuclear Laboratories Limited; HYDRO QUEBEC
Source: IAEA Power Reactor Information System (PRIS), as of 2026-10-14.
Fuel Cycle Facilities
Fuel cycle plants at this site, as listed in the IAEA Nuclear Fuel Cycle Facilities Database: what each plant does, its scale and design capacity, the years it operated, its current status and who operates it.
2 facilities: 1 in operation, 1 shutdown.
| Facility | Type | Scale | Design Capacity | Operated | Status | Operator |
|---|---|---|---|---|---|---|
| Gentilly 2 NPP Site | AFR Dry Spent Fuel Storage | Commercial | 2518 t HM | 1995– | In Operation | Hydro-Quebec |
| Gentilly 1 NPP Site | AFR Dry Spent Fuel Storage | Commercial | 0 t HM | 1985–2025 | Shutdown | Atomic Energy of Canada Ltd (AECL) |
Source: IAEA Nuclear Fuel Cycle Facilities Database (NFCFDB), as of 2026-10-13.
Working Here
Per Diem Rates FY 2026
Per diem covers lodging and meals & incidental expenses (M&IE) for government and contractor travel near this facility. Rates are from the U.S. State Department foreign per diem tables for FY 2026.
$167
Lodging/Night
$120
M&IE/Day
$287
Total/Day
Canada: rate for locations the State Department does not list separately
U.S. Department of State foreign per diem, for U.S. government and contractor travel.
Photos
Photos of this facility from the NukeWorker photo gallery. Click the header or any photo to browse the full album.
Facility Map
Interactive satellite map showing the facility's geographic location. Marker color indicates current status: green for online, red for offline, orange for reduced power. Click the header to open in Google Maps satellite view.
46.3946, -72.3565
Location & Contact
Physical address, phone number, and website for this facility. Use the directions link to get driving directions via Google Maps.
NukeWorker Member Ratings 2 votes
Community ratings from NukeWorker members. Vote to share your experience working at this facility. Score uses a Bayesian average that accounts for vote count — facilities with few votes are pulled toward the fleet average, so rankings reflect confidence, not just raw percentages.
Above Average
1 (50%)
Below Average
1 (50%)
Plant Facts
About This Site
Written by NukeWorker from public records: facts that do not change. Operator, status and capacity come from the live data elsewhere on this page. Sources: Wikipedia: Gentilly Nuclear Generating Station.
Gentilly is a nuclear power station site at Bécancour, Quebec, on the St. Lawrence River.
Read more
The site had two reactors. Gentilly 1 was a prototype CANDU-BWR rated at 250 MWe, with vertical pressure tubes and light-water coolant. It was connected to the grid on 5 April 1971 and shut down on 1 June 1977 after a record of technical problems. Gentilly 2 is a CANDU 6 heavy-water reactor supplied by Atomic Energy of Canada Limited. Construction began in 1973, and it was connected to the grid on 4 December 1982 and commissioned on 1 October 1983. It was shut down on 28 December 2012, after a planned refurbishment was cancelled in October 2012.
Technical Specs
Reactor design specifications including type (PWR/BWR), containment design, nuclear steam supply system manufacturer, thermal and electrical power ratings, and current operational status.
Reactor Type:
CANDU